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Man Pages


Manual Reference Pages  -  SOINDEXEDNURBSSURFACE (3)

NAME

SoIndexedNurbsSurface — indexed NURBS surface shape node

CONTENTS

Inherits From
Synopsis
Description
Fields
Methods
Action Behavior
File Format/defaults
See Also

INHERITS FROM

SoBase > SoFieldContainer > SoNode > SoShape > SoIndexedNurbsSurface

SYNOPSIS

#include <Inventor/nodes/SoIndexedNurbsSurface.h>

Fields from class SoIndexedNurbsSurface:

    SoSFInt32    
                    
SoSFInt32            numUControlPoints    
SoSFInt32    
                    
SoSFInt32            numVControlPoints    
SoMFInt32    
                    
SoMFInt32            coordIndex    
SoMFFloat    
                    
SoMFFloat            uKnotVector    
SoMFFloat    
                    
SoMFFloat            vKnotVector    
SoSFInt32    
                    
SoSFInt32            numSControlPoints    
SoSFInt32    
                    
SoSFInt32            numTControlPoints    
SoMFInt32    
                    
SoMFInt32            textureCoordIndex    
SoMFFloat    
                    
SoMFFloat            sKnotVector    
SoMFFloat    
                    
SoMFFloat            tKnotVector

Methods from class SoIndexedNurbsSurface:

       
                    
                     SoIndexedNurbsSurface()    
static SoType    
                    
static SoType        getClassTypeId()

Methods from class SoNode:

    void    
                    
void                 setOverride(SbBool state)    
SbBool    
                    
SbBool               isOverride() const    
SoNode *    
                    
SoNode *             copy(SbBool copyConnections = FALSE) const    
virtual SbBool    
                    
virtual SbBool       affectsState() const    
static SoNode *    
                    
static SoNode *      getByName(const SbName &name)    
static int    
                    
static int           getByName(const SbName &name, SoNodeList &list)

Methods from class SoFieldContainer:

    void    
                    
void                 setToDefaults()    
SbBool    
                    
SbBool               hasDefaultValues() const    
SbBool    
                    
SbBool               fieldsAreEqual(const SoFieldContainer *fc) const    
void    
                    
void                 copyFieldValues(const SoFieldContainer *fc, SbBool copyConnections = FALSE)    
SbBool    
                    
SbBool               set(const char *fieldDataString)    
void    
                    
void                 get(SbString &fieldDataString)    
virtual int    
                    
virtual int          getFields(SoFieldList &resultList) const    
virtual SoField *    
                    
virtual SoField *    getField(const SbName &fieldName) const    
SbBool    
                    
SbBool               getFieldName(const SoField *field, SbName &fieldName) const    
SbBool    
                    
SbBool               isNotifyEnabled() const    
SbBool    
                    
SbBool               enableNotify(SbBool flag)

Methods from class SoBase:

    void    
                    
void                 ref()    
void    
                    
void                 unref() const    
void    
                    
void                 unrefNoDelete() const    
void    
                    
void                 touch()    
virtual SoType    
                    
virtual SoType       getTypeId() const    
SbBool    
                    
SbBool               isOfType(SoType type) const    
virtual void    
                    
virtual void         setName(const SbName &name)    
virtual SbName    
                    
virtual SbName       getName() const

DESCRIPTION

This shape node represents a NURBS surface based on the knot vectors and the control points that you specify. The uKnotVector and vKnotVector fields specify floating-point arrays of values; the values are the coordinates of the knot points in the surface, and you must enter them in non-decreasing order. The numUControlPoints and numVControlPoints fields specify the number of control points the surface will have in the U and V parametric directions, and will use the current coordinates that are indexed from the coordIndex field.

You can get a surface of minimum order (2) in the U or V directions by specifying two more knots than control points in that direction and having at least two control points in that direction. This surface would appear creased in one direction.

You can get a surface of maximum order (8) in the U or V directions by specifying eight more knots than control points in that direction and having at least eight control points in that direction.

The control points of the NURBS surface are transformed by the current cumulative transformation. The surface is drawn with the current light model and drawing style. The coordinates, normals, and texture coordinates of a surface are generated, so you cannot bind explicit normals or texture coordinates to a NURBS surface. The first material in the state is applied to the entire surface.

The surface is trimmed according to the currently defined profiles curves.

When default texture coordinates are applied to a NURBS surface, the edges of the texture square are stretched to fit the surface. The axes of the texture are called S and T; S is horizontal and T is vertical. The axes of the NURBS surface are called U and V; U is horizontal and V is vertical. You can also define texture coordinates explicitly with the S,T location point, the knot vectors, and the current texture coordinates.

FIELDS

    SoSFInt32    
                    
SoSFInt32            numUControlPoints    
SoSFInt32    
                    
SoSFInt32            numVControlPoints
Number of control points in the U and V directions.

    SoMFInt32    
                    
SoMFInt32            coordIndex
Coordinate indices.

    SoMFFloat    
                    
SoMFFloat            uKnotVector    
SoMFFloat    
                    
SoMFFloat            vKnotVector
The knot vectors in the U and V directions.

    SoSFInt32    
                    
SoSFInt32            numSControlPoints    
SoSFInt32    
                    
SoSFInt32            numTControlPoints
Number of control points in the S and T directions.

    SoMFInt32    
                    
SoMFInt32            textureCoordIndex
Texture coordinate indices.

    SoMFFloat    
                    
SoMFFloat            sKnotVector    
SoMFFloat    
                    
SoMFFloat            tKnotVector
The knot vectors in the S and T directions.

METHODS

       
                    
                     SoIndexedNurbsSurface()
Creates an indexed NURBS surface node with default settings.

    static SoType    
                    
static SoType        getClassTypeId()
Returns type identifier for this class.

ACTION BEHAVIOR

SoGLRenderAction
Draws the surface based on the current coordinates, material, and so on.

SoRayPickAction
Picks the surface based on the current coordinates and transformation.

SoGetBoundingBoxAction
Computes the bounding box that encloses all control points of the surface with the current transformation applied to them. Sets the center to the average of the control points.

SoCallbackAction
If any triangle callbacks are registered with the action, they will be invoked for each successive triangle approximating the surface.

FILE FORMAT/DEFAULTS

IndexedNurbsSurface {



numUControlPoints  0
numVControlPoints  0
numSControlPoints  0
numTControlPoints  0
coordIndex         0
uKnotVector        0
vKnotVector        0
sKnotVector        0
tKnotVector        0
textureCoordIndex  -1


}

SEE ALSO

SoIndexedNurbsCurve, SoNurbsSurface, SoProfile

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